Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

What is a horizontal row of the periodic table called?

1. AA group
2. BA period
3. CA family
4. DA block

Which is a sign that a chemical reaction may have taken place?

1. AWater freezes into ice when put in a freezer
2. BA gas is produced when two liquids are mixed
3. CA block of wax melts when it is heated
4. DSugar dissolves completely when stirred into water

Which gas is needed for a fuel to burn (combustion)?

1. AHelium
2. BOxygen
3. CCarbon dioxide
4. DNitrogen

Which statement describes a saturated fat?

1. AIts fatty acid chains have no carbon–carbon double bonds
2. BIts fatty acid chains have many carbon–carbon double bonds
3. CIt contains no carbon atoms
4. DIt is always liquid at room temperature

Kuris pokytis padarytų, kad kreidos gabalėlis greičiau reaguotų su rūgštimi?

1. AVieno didelio kreidos gabalo naudojimas
2. BRūgšties praskiedimas daugiau vandens
3. CRūgšties atšaldymas šaldytuve
4. DKreidos susmulkinimas į miltelius

Which bond joins amino acids together in a protein?

1. AA glycosidic bond
2. BA hydrogen bond
3. CAn ionic bond
4. DA peptide bond

Which list puts fluorine, chlorine and bromine in order of increasing electronegativity?

1. AF < Cl < Br
2. BBr < Cl < F
3. CBr < F < Cl
4. DCl < Br < F

Why is Dmitri Mendeleev's early periodic table regarded as such a success?

1. AHe left gaps and correctly predicted the properties of elements not yet discovered
2. BHe discovered the noble gases and placed them in group 18
3. CHe arranged the elements by atomic number, which he had discovered
4. DHe proved that the atoms of every element contain electrons